Improvement in pressure-regulating valves



w. CRAIG @L H.' LQBREVRT.

Pressu're Regulating Valves.

Patented September T6, 1873..

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[leve/@tors a mm mi UNITED STATES PA'I'EN'I GIEICE.

WILLIAM CRAIG, OF NEWARK, NEW JERSEY, AND HENRY IL. BREVOORT, OF KINGS COUNTY, NEW YORK.

IMPROVEMENT IN PRESSURE-REGULATING VALVES.

Specication forming part of Letters Patent No. 142,773, dated September 16, 1873; application tiled October 5, 1872.

To all whom it may concern:

Be it known that we, WILLIAM CRAIG, of Newark, in the county of Essex and State of New Jersey, and HENRY L. BREvooRT, in the county of Kings and State of New York, have invented a new and useful Improvement in Pressure-Regulating Valves; and we do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawing forming part of this specification, and in which- Figure l represents a vertical longitudinal sectional elevation; Fig. 2, a top view of the center portion; Fig.- 3, a transversevertical sectional elevation. Fig. 4 represents three different views of the dog. Fig. 5 represents two views of the crank and pin.

Similar letters of reference indicate corresponding parts.

Our invention relates to that kind of valve which has more than one outlet guiding the uid or gas into one or the other channel at the pleasure ofthe operator, regardless of the fluid or gas so directed. Other valves have been constructed for similar purposes giving precisely the same results; but it is claimed that this valve is more simple in construction, and more reliable and positive in its action at varying pressures. Nothing is claimed as new in the operation itself, but simply the means of performing said operation.

On referring to the accompanying drawing it will be observed that a cast-iron or brass body is formed, as seen at A, Figs. l, 2, and 3, which has three openings in it, as seen at a b c, made in such a manner that a pipe may be readily attached to each and every one. Within this cast-iron case two circular projections, as seen at A and B', are cast, forming the seats for the poppet-valves. At B is seen the valve, resting steam or air tight against one of them, while it is lifted from the other into an open position, allowing any fluid or gas free and unobstructed passage. These two valves are connected by a metallic spindle or stem, as seen at D, on which both valves are firmly attached by nuts or pins. The distance between these valves is greater by the desired extent of lift or opening than the distance be tween the valve-seats. By this arrangement,

when one valve is in place upon its seat the other is about one-quarter of its diameter removed from the seat, on which, by certain operation's, it can be placed, displacing the other valve, hitherto closed. When all the openings are connected with pipes some means have to be provided to operate the valves in the described manner from the outside of the valvecasing A. To accomplish this operation there is fastened iirmly to the Yvalve-stem D a dog or piece of metal made in the form shown at d, Fig. 4, which is attached to the valve-stem by a set-screw or pin, or in some convenient manner. This dog d has a slot in the portion which is farthest fromthe valve-stem, as seen at d. This slot d is of a sufficient size to admit of the crank-pin f sliding freely within it, upward or downward, as the case may be. Coming through the metal of the side of the body of the valvecasing is a rod, as seen at E, Figs. 1, 2, 3. The proper provisions are made in the body A of the casing to admit of this rod being revolved a portion of a revolution freely in either direction. Attached to the inside end of the rod E is a crank, e, having a pin, f, which pin f slides up or down in the slot d of the dog. On the outside the rod E is furnished with a handle or lever, G, having, in some cases, a weight, H, attached. Placed in each end, so to speak, of the valvecasing A, is cast a guide, forming part of the casing A, through which both ends of the valve-stems can slide freely, making the seating of the valves a matter of certainty. These guides are seen at g g, Figs. l and 3.

The operation of the apparatus is very simple. Supposing pipes to be connected to the openings a b c, b is the opening through which the steam, air, or water is received; then, by operating the lever G and chan gingthe positions of the valves, the incoming gas or iiuid can be delivered through either of the openings a or c, as occasion may require. As before described, this is accomplished by moving the position of the lever Gr, which revolves the shaft E a part of a turn, and a crank-pin, f, is therefore moved through part of the circumference of a circle, and in making this movement the dog d, attached to the valve-stem, is moved with the pin, and, consequently, the

2 maeva valves are forced to change their position, the one which was seated opening, and the one which Was open coming to a seat. It is evident that ,by this chan ge any substance entering at b will be delivered at a if the valve B is open, or at c if the valve C is open. In this Way this device forms a perfect two-Way balance-valve, directing the flowing air, steam, gas, or Water into either of the two passages at will.

This valve will serve as a safety-valve for pipes used in heating buildings where, at times, the pressure becomes too great, endangering the pipes and causing an explosion unless some adequate means of relief can be found for the overplus of pressure. When used in this Way the Weight H is placed on the lever Gr, which resists the desire of the closed valve to open until the pressure more than circumbalanees the effect ofthe Weight. When this becomes the case the closed valve opens and allows the steam to flow into the air or some reservoir provided for this purpose. When a sufcient A device of this nature is abso lutely necessary, preventing, as it does, serious dam age.

Although this valve is mainly intended for use on exhaust-pipes of steam-engines, it presents itself as a perfect arrangement of safetyvalves for pipes in Which an even pressure must be maintained. Itis also possible to easily change the amount of pressure which the valve Will bear by merely changing theweights position on the lever Gr.

Many other situations exist Where this valve can be advantageously used, the one described being sufficient to illustrate its principle.

The great feature of this device is its cheapness of construction, its great simplicity, and ease and certainty of operation.

What is here claimed, and desired to be secured by Letters Patent, is-

The combination of the casting A, having inlet Z) and outlets a c, With the valves B G attached to stem D, provided With dog d and crank-pin j', and the weighted lever Gr, constructcd substantially as and for the purpose set forth.

WILLIAM CRAIG.

y HENRY L'. BREVOORT.

Witnesses:

J oHN RICHTER, GEORG-E J. WARNER. 

